UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
*9274339324*
5014/21
ENVIRONMENTAL MANAGEMENT
Alternative to Coursework
May/June 2010
1 hour 30 minutes
Candidates answer on the Question Paper.
Additional Materials:
Ruler
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Study the appropriate Source materials before you start to write your answers.
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these data. Suggestions for data sources are given in some questions.
You may use the source data to draw diagrams and graphs or to do calculations to illustrate your answers.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
For Examiner’s Use
This document consists of 17 printed pages and 3 blank pages.
DC (SLM) 24620/1
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Costa Rica
Fig. 1 Map of the world with Costa Rica shown
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N
Lake Arenal
volcano
Pacific
Ocean
0
Caribbean
Sea
proposed
site of
Boruca dam
40
km
Fig. 2 Map of Costa Rica
•
•
•
•
•
•
•
•
•
Area of Costa Rica: 51 100 sq km
Population: 4 215 914
Children per woman: 2.17
Life expectancy at birth: 77.4 years
Currency: Costa Rica Colon (CRC) (520 CRC = 1 US Dollar)
Languages: Spanish, English
Climate: tropical; dry season (December – April); rainy season (May – November); cooler in
highlands
Terrain: coastal plains separated by mountains, including several active volcanoes
Main exports: bananas, pineapples, coffee, melons, sugar, seafood, electronic components,
medical equipment
Costa Rica has a stable economy that depends on tourism, agriculture and electronics exports. Poverty
has remained around 20%. Recently, immigration of mostly unskilled labour has placed heavy demands
on the social welfare system. Agricultural products that are not exported include corn, rice, beans,
potatoes, beef and timber. Industry includes food processing, construction materials, fertilizers and
plastic products.
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1
(a) Look at the information about Costa Rica.
Suggest two reasons why some agricultural products are not exported.
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(b) The export products are all of high value. Explain how this benefits Costa Rica.
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(c) Pineapples are a crop grown in the coastal plains of the country. More than 3 million
tonnes are exported all over the world.
Fig. 3 Pineapples in Costa Rica
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(i)
Pineapples are always planted in rows one metre apart. The planting density can
be changed by altering the spacing between each plant along the rows.
For
Examiner’s
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1.0 m
key
pineapple plant
0.4 m
Fig. 4 Pineapple planting
The farmer intends to double the planting density. Show what this would look like in
Fig. 5.
1.0 m
Fig. 5
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(ii)
Planting density has an effect on pineapple yield.
Planting density
(thousands of plants per ha)
Yield
(tonnes per ha)
20
36
30
52
40
69
50
80
60
90
70
95
80
95
Plot the data on a graph (Fig. 6).
For
Examiner’s
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[4]
Fig. 6
(iii)
From your graph, estimate the yield at a planting density of 35 thousand per
hectare.
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(iv)
Give two reasons why a pineapple farmer would not use a planting density of
80 thousand per hectare.
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(d) (i)
Fig. 7 shows the percentage reduction of soil erosion for different planting densities
compared with that of bare soil.
100
90
80
70
60
reduction
of soil
50
erosion
(%)
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
planting density
(thousands of plants per ha)
Fig. 7 Percentage reduction of soil erosion
Describe the pattern (trend) shown in the graph (Fig. 7).
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(ii)
Using your own knowledge, and the information shown in Fig. 6 and Fig. 7, suggest
one planting density a farmer should use.
Planting density .........................................
Reason .....................................................................................................................
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(iii)
What is soil erosion?
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(iv)
Describe the causes of soil erosion.
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(e)
For
Examiner’s
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16 cm
mass
1.50 kg
16 cm
12.5 cm
Fig. 8 Pineapple
Some students wanted to investigate the effect of different planting densities on the size
of pineapples at harvesting. They proposed three different plans.
Plan
One
Select one field of high density and one of low density. Walk into each field and pick two
pineapples. Measure the diameter of each fruit.
Plan Two
Select five fields, each with a different density. Pick five pineapples from each field.
Measure the diameter of each fruit.
Plan Three
Select five fields, each with a different density. Pick five pineapples from each field.
Measure the diameter, height and mass of each fruit.
(i)
The students decided not to carry out Plan One. Explain why.
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(ii)
In the space below draw a table to record the measurements for Plan Two.
For
Examiner’s
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[3]
(iii)
Give two reasons why the students decided to carry out Plan Three.
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2
For
Examiner’s
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Fig. 9 Lake and volcano
Lake Arenal was made three times its original size by building a dam. One thousand local
people were moved from the land after the dam was built. The dam generates hydro-electric
power (HEP) and supplies about 10% of the country’s electricity.
(a) (i)
The government spent 4 million US dollars to relocate the local people. What is the
cost for each person?
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(ii)
Explain why the government decided to pay so much to relocate the local people.
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(b) Explain why a large lake is an advantage for HEP generation.
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(c) Since the lake has been enlarged the fish populations have increased. Some tourists
come to the lake to fish for snook and a species of flying fish, known as machaca.
Every tourist must get a permit to fish in the lake.
Suggest why the government requires tourists to have a permit.
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(d) Cattle farming takes place on some parts of the land surrounding the lake.
The cattle can graze over large areas and the land is never ploughed.
Some students wanted to find out if cattle farming caused any damage to the lake
ecosystem. They took water samples from an area without cattle and some from
an area with cattle to test for nitrate and phosphate levels. The results are shown in
Fig. 10.
Area without cattle
Area with cattle
Sample
Nitrate
ppm
Phosphate
ppm
Sample
Nitrate
ppm
Phosphate
ppm
1
55
9
6
45
10
2
40
8
7
40
8
3
45
9
8
45
8
4
40
10
9
48
9
5
40
8
10
42
8
Average
44.0
8.8
Average
44.0
8.6
(ppm = parts per million)
Fig. 10
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(i)
Do you think cattle farming is affecting the lake ecosystem? Use the information in
the table to help give reasons for your answer.
For
Examiner’s
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(ii)
The students highlighted one of their measurements. Which one? Why?
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(iii)
Why should the students repeat their sampling?
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(e) Describe what would happen to Lake Arenal if the level of nitrate and phosphate
increased.
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(f)
A farmer has a piece of land by the lake with easy access to a road. The farmer wants
to put up fences and grow pineapples. The pesticide bromacil has to be used to grow
pineapples successfully. When the pesticide enters the soil it takes 60 days for half of it
to be broken down.
Two small trial fields (A and B) were planted as shown in Fig. 11.
B
A
R
100 m
50 m
P
S
lake
Q
T
Fig. 11
Both fields were planted at the same time and with the same planting density. Equal
quantities of bromacil were used. A test was carried out by government scientists to
measure for the presence or absence of bromacil.
Sample sites
Days from
planting
P
Q
R
S
T
60
✓
✗
✓
✗
✗
120
✓
✗
✓
✓
✗
180
✓
✓
✓
✓
✗
240
✗
✗
✗
✗
✓
300
✓ = bromacil present
✗ = bromacil absent
Fig. 12
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(i)
Describe the pattern of results shown by the pesticide tests.
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(ii)
Complete Fig. 12 for readings you would expect at sites P–T after 300 days.
[1]
(iii)
Explain why the government scientists refused to allow the farmer to grow
pineapples after this trial.
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3
The government has been considering a proposal to build the Boruca Dam for 30 years.
Some statements made about the proposal are:
•
•
•
•
•
•
•
(a) (i)
The dam would provide 100% of the country’s electricity
5 000 people will need to be relocated
The dam should generate electricity for 60 years
25 000 hectares of farming land will be flooded
Foreign companies want to loan the government money to build the dam
The dam will silt up and produce less electricity in the future
The government will be paying back loans for 50 years.
Select one statement and explain why it would be an advantage to Costa Rica.
Statement .................................................................................................................
Advantage .......................................................................................................... [1]
(ii)
Select one statement and explain why it would be a disadvantage to the economy
of Costa Rica.
Statement .................................................................................................................
Disadvantage ..................................................................................................... [1]
(iii)
Select one statement and explain why it would be a disadvantage to local people.
Statement .................................................................................................................
Disadvantage ..................................................................................................... [1]
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(b) A foreign company wants to help build an aluminium smelting works close to the Boruca
Dam. This could use up to 85% of the power produced. It takes a large amount of
electricity to produce aluminium from its ore, bauxite.
Costa Rica has bauxite deposits but, unfortunately, not enough can be extracted to
make the works profitable.
The rest of the bauxite would have to be imported by sea from its mining operations in
other countries.
BAUXITE + ELECTRICAL ENERGY = ALUMINIUM + OXYGEN
(i)
Explain why the aluminium smelter is an example of sustainable production.
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(ii)
State the other arguments in favour and state the arguments against the building of
the aluminium smelter. In your view, which are the stronger?
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